文件上传下载异常

遇到异常:Can not find a java.io.InputStream with the name [inputStream] in the invocation stack. Check the <param name="inputName"> tag specified for this action.

异常原因:返回inputStream的方法返回值为null,因为没有获取到文件名(将文件名放在session域却没在session域中取)

错误代码:myfileFileName = ActionContext.getContext().get("myfileFileName").toString();

解决方案:myfileFileName = ActionContext.getContext().getSession().get("myfileFileName").toString();